Debt is debt, you have to pay up anyway.
I don't care what you plan to use the money for, just pay back what you lend and you will be free, stupid people take loans and spent it on stupid things while the rich and smart people takes loan and use it for a greater course that could benefit them in future.
Still, even if you use loan money to invest in good business there is still a risk, the business might fail and been in good debt or bad debt will be meaningless, because a debt is still a debt.
Taking out a loan to invest in bitcoin is risky, but taking out a loan to start a business is not. When you take out a loan as a business owner, the first thing you do is decide what kind of business you will run to make money, and even if you don't make money right away, you won't lose the money you started with. A business can never fail if you set your goals correctly as a good business owner.
My point is that, while I don't see anything wrong with taking loan to launch a business, doing so to invest in bitcoin is very risky since you can't sell bitcoin whenever you want and sell products whenever you want to make profit